Zilog Z80380 - Manual (Page 63)

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Z380 ™
U SER ' S M ANUAL Z ILOG
DC-8297-03
BIT
BIT TEST
BIT b,dst dst = R, IR, X
Operation: Z
←
NOT dst(b)
The specified bit b within the destination operand is tested, and the Zero flag is set to 1 if
the specified bit is 0, otherwise the Zero flag is cleared to 0. The contents of the destination
are unaffected. The bit to be tested is specified by a 3-bit field in the instruction; this field
contains the binary encoding for the bit number to be tested. The bit number b must be
between 0 and 7.
Flags: S: Unaffected
Z: Set if the specified bit is zero; cleared otherwise
H: Set
V: Unaffected
N: Cleared
C: Unaffected
Addressing Execute
Mode Syntax Instruction Format Time Note
R: BIT b,R 11001011 01bbb-r- 2
IR: BIT b,(HL) 11001011 01bbb110 2+r
X: BIT b,(XY+d) 11y11101 11001011 ——d— 01bbb110 4+r I
Field Encodings: r: per convention
y: 0 for IX, 1 for IY